How Clean Is Johnson Lake?
Johnson Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 36.9 ft. Phosphorus: 14.1 µg/L. Trophic State Index: 34.
Cleanliness Snapshot
| Metric | Johnson Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 36.9 ft | — |
| Phosphorus | 14.1 µg/L | <30 = clean |
| Trophic State Index | 34 | <50 = clean |
How does Johnson Lake compare?
Johnson Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #13 of 70 lakes in Burnett County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.